<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>  
    <!--卡片视图-->
    <el-card>
      <!--添加角色按钮区域-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!--角色列表区域-->
      <el-table :data="rolelist" border stripe>
        <!--索引列-->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row v-for="(item,index) in scope.row.children" :key="item.id" 
                    :class="['bdbottom', 'vcenter', index == 0? 'bdtop' : '']">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRight(scope.row, item.id)">{{item.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <el-row v-for="(item2,index2) in item.children" :key="item2.id" :class="{bdtop: index2 !== 0, vcenter: true}">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRight(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3,index3) in item2.children" 
                      :key="item3.id" closable @close="removeRight(scope.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!--展开列-->
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" 
                       @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!--分配权限的对话框-->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" @close="resetRights" width="50%">
      <el-tree :data="rightlist" :props="rightProps" show-checkbox node-key="id" 
        default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default{
    data() {
      return{
        //所有角色列表数据
        rolelist:[],
        //分配权限对话框的显示隐藏
        setRightDialogVisible: false,
        //所有权限的数据
        rightlist:[],
        rightProps:{
          children: 'children',
          label: 'authName'
        },
        //三级权限节点ID
        defKeys:[],
        roleId: 0,
      }
    },
    created() {
      this.getRoleList()
    },
    methods: {
      //获取所有角色列表数据
      async getRoleList() {
        const res = await this.$http.get('roles');
        if(res.data.meta.status !== 200) {
          return this.$message.error('获取角色列表失败!')
        }
        this.rolelist = res.data.data;
      },
      //根据id删除权限
      async removeRight(role,rightId) {
        const confimResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
          confirmButtonText: '确定',  //如果点击了确定 则返回值是confirm
          cancelButtonText: '取消',   //如果点击了取消 则返回值是cancel
          type: 'warning'
        }).catch(error => error)
        if(confimResult !== 'confirm') return 
        const res = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
        if(res.data.meta.status !== 200){
          return this.$message.error('删除权限失败!');
        }
        this.$message.success('删除权限成功')
        // this.getRoleList()   会刷新页面
        role.children = res.data.data;
      },
      async showSetRightDialog(role) {
        this.roleId = role.id;
        const res = await this.$http.get('rights/tree');
        if(res.data.meta.status != 200) {
          return this.$message.error('获取权限数据失败!');
        }
        this.rightlist = res.data.data;
        this.getLeafKeys(role,this.defKeys)
        this.setRightDialogVisible = true;
      },
      //通过递归 获取角色三级权限的id，并保存到defKeys数组中
      getLeafKeys(node,arr){
        if(!node.children){
          return arr.push(node.id)
        }
        node.children.forEach(item => this.getLeafKeys(item,arr));
      },
      //点击取消或确定会重置权限数组的数据
      resetRights() {
        this.defKeys = []
      },
      //在对话框点击确定按钮为角色分配权限
      async allotRights() {
        this.setRightDialogVisible = false;

        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const idStr = keys.join(',');
        const res = await this.$http.post(`roles/${this.roleId}/rights`,{rids: idStr})
        if(res.data.meta.status !== 200){
          return this.$message.error('分配权限失败!');
        }
        this.$message.success('分配权限成功!');
        this.getRoleList();
      }
    }
  }
</script>

<style scoped>
.el-breadcrumb{
  margin-bottom: 15px;
  font-size: 12px;
}

.el-tag{
  margin: 7px;
}

.bdtop{
  border-top: 1px solid #eee;
}

.bdbottom{
  border-bottom: 1px solid #eee;
}

.vcenter{
  display: flex;
  align-items: center;
}
</style>